The correct answer is D. Ferozepur.
The Regional Formula was a proposal for the reorganization of the Indian states that was adopted by the Indian National Congress in 1947. The formula proposed that the states of India be reorganized on a linguistic basis, with each state being composed of people who speak the same language.
The Regional Formula was not implemented in its entirety, but it did lead to the creation of several new states, including the state of Haryana. The state of Haryana was created in 1966, and it included the districts of Karnal, Hisar, and Gurugram. However, the district of Ferozepur was not included in the state of Haryana. Ferozepur is located in the state of Punjab, and it is a predominantly Punjabi-speaking area.
The Regional Formula was controversial, and it was opposed by some groups who felt that it would lead to the break-up of India. However, the formula was ultimately adopted by the Indian government, and it has had a significant impact on the political and social landscape of India.